Note: RAMPS is deprecated technology. We provide new electronics, like Megatronics. Which is better value, has more features and is compatible with Arduino software. Also note that the components used on RAMPS boards are generally of lower quality. It is advised to use Megatronics instead of RAMPS for new printers. Check our electronics comparison page here for more details.
RepRap Arduino Mega Pololu Shield, or RAMPS for short. It is designed to fit the entire electronics needed for a RepRap in one small package for low cost. RAMPS interfaces an Arduino MEGA with the powerful Arduino MEGA platform and has plenty room for expansion. The modular design includes plug in stepper drivers and extruder control electronics on an Arduino MEGA shield for easy service, part replacement, upgrade-ability and expansion. Additionally as long as the main RAMPS board is kept to the top of the stack a number of Arduino expansion boards can be added to the system.
This is a pre-assembled RAMPS board. However, you will need additional components like stepper drivers, thermistors and an Arduino Mega.